EP1867077A1 - Procede et dispositif d'emission en modulation de frequence de donnees audio a destination d'un recepteur radio mf a fonctionnalite srd - Google Patents

Procede et dispositif d'emission en modulation de frequence de donnees audio a destination d'un recepteur radio mf a fonctionnalite srd

Info

Publication number
EP1867077A1
EP1867077A1 EP05780475A EP05780475A EP1867077A1 EP 1867077 A1 EP1867077 A1 EP 1867077A1 EP 05780475 A EP05780475 A EP 05780475A EP 05780475 A EP05780475 A EP 05780475A EP 1867077 A1 EP1867077 A1 EP 1867077A1
Authority
EP
European Patent Office
Prior art keywords
frequency
audio data
radio
transmission
audio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05780475A
Other languages
German (de)
English (en)
Other versions
EP1867077B1 (fr
EP1867077A4 (fr
Inventor
Ken Mason
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Original Assignee
Nokia Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Oyj filed Critical Nokia Oyj
Publication of EP1867077A1 publication Critical patent/EP1867077A1/fr
Publication of EP1867077A4 publication Critical patent/EP1867077A4/fr
Application granted granted Critical
Publication of EP1867077B1 publication Critical patent/EP1867077B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/03—Constructional details, e.g. casings, housings
    • H04B1/034—Portable transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/62—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast for transportation systems, e.g. in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02—Arrangements for relaying broadcast information
    • H04H20/08—Arrangements for relaying broadcast information among terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method and a device for transmitting audio data from an audio playback device to an RDS capable FM radio receiver. Particularly it relates to transmitting audio data from a mobile playback device to an RDS capable car radio system.
  • Another example would be to use such a player as a replacement for a CD-changer in a vehicle.
  • car radio systems usually do not comprise any input interface to connect a mobile player.
  • mobile music players is the possibility to easily carry it along it would be desirable if it could be coupled with other equipment in a standardized way, with some kind of common interface.
  • the FCC Federal Communications Commission
  • a transmitter can thus be used for conveniently transmitting sound or music from any device wirelessly to an FM radio operating in the 88 - 108 MHz band, e.g. from a CD-player or an MP3-player. This allows listening to music from such a device e.g. through a car FM radio.
  • interference with licensed FM transmitters e.g. a radio station, is usually not allowed.
  • the Radio Data System is an extension of the standard FM radio transmission. It allows FM broadcasters to send more than just an analog audio signal out over the air interface. Stations can transmit digital RDS data for reception by RDS-equipped FM tuners. This technology opens up a whole new range of services to a listener with RDS reception capability.
  • the RDS system itself is not part of the present invention and shall thus not be described in detail here. Detailed information about the function of RDS can be obtained from many sources.
  • AF Alternate Frequency
  • the original RDS broadcast contains a coded list of all the alternate frequencies carrying the same information, i.e. being used for broadcasting the same program.
  • the RDS circuitry will search the alternate frequencies for the strongest, most useable signal and automatically switch to it without any action required by the listener.
  • the most prominent use case is a moving FM radio receiver, e.g. a car stereo system.
  • the moving receiver will occasionally leave a reception area of a certain station/program transmitting on a certain frequency. If that station is part of a network broadcasting the program, with a number of transmitting stations with different geographical location and each with its own frequency for the same program, the AF feature of RDS enables the receiver to tune to the best station for that specific program at all times. That is, the FM tuner is automatically tuned to the frequency of the station providing the best reception of the same program.
  • a method for radio transmission of audio data from an audio player device for being received by an RDS capable FM radio receiver comprises the steps of scanning an FM frequency range to detect available radio frequencies on which no broadcast transmissions or interfering signals are currently received (i.e. no signals having a level above a pre-determined threshold, like e.g. the background noise level); storing detected available frequencies; selecting one of the stored frequencies; receiving audio data from the audio player; modulating the received audio data with FM modulation; and - transmitting the modulated audio data on the selected frequency.
  • the step of scanning the FM frequency range to detect available radio frequencies is repeated. If available frequencies have changed, the stored frequencies are updated accordingly. As the situation related to free frequencies can change during time, particularly within a moving vehicle, it is necessary to update the stored frequencies in order to provide a list of available frequencies at all times.
  • the invention includes different ways of repeating the scanning step, for example a fixed re-scan interval or a scan triggered when certain pre-determined criteria are fulfilled. It is within the scope of the invention to scan only a sub-set of frequencies instead of the whole frequency range, or only to re-scan the stored frequencies. Advantages of performing the scanning in this manner will become apparent in the following description.
  • the transmission of the audio data is interrupted while performing the scanning operation.
  • the method further comprises transmitting at least one of the stored frequencies to be received by the RDS capable FM radio receiver as Alternate Frequency of the RDS system. That is, the Alternate Frequency feature AF of the RDS system is used to provide alternative frequencies to the FM radio receiver. In this manner the FM radio receiver is always provided with at least one alternate frequency. Although the transmitter only transmits on the selected frequency it may be advantageous to provide the alternate frequency even though the presently used frequency is currently available and the radio connection is stable. If a sudden distortion would occur it might be impossible to still transmit on this frequency, such that the FM radio receiver is not able to receive the RDS information containing the alternate frequency.
  • the method further comprises - interrupting the transmission of said modulated audio data; selecting the at least one transmitted Alternate Frequency; switching to said selected frequency; and resuming transmission of said audio data using said selected frequency.
  • This embodiment constitutes the basis for different further embodiments. In one variant this enables to occasionally change between frequencies that are in the list of available ones, and then perform the above mentioned re-scanning. Particularly this is necessary in order to check the frequency just left, as detecting the availability of this frequency is impossible while a transmission is simultaneously performed using this frequency. Therefore the transmitter and thus also the transmission have to be shut down during such a check. The check can be made considerably short in duration. However switching the transmission frequency to another of the stored alternative frequencies will usually provide more time for performing the check, as switching between frequencies can be done rather fast, depending on the capabilities of the respective FM radio receiver.
  • Switching to an alternative frequency can be done on a time-based scale, e.g. every 2 minutes, i.e. without additional trigger events. This enables the above described "background" type of scanning. However the above described embodiment also enables to trigger the switching to another frequency when the presently used frequency becomes unavailable due to a licensed transmission or an interfering signal on the frequency.
  • the method further comprises detecting if the frequency presently used for transmission is still available; and alternatively: a) if the present frequency is still available, resuming transmission of said audio data on the present frequency; or b) if the present frequency is not available anymore selecting the at least one transmitted alternate Frequency; switching to said selected frequency; and resuming transmission of said audio data using said selected frequency. That is, a switching of the frequency is performed like already described above.
  • the main object of the present invention is to ensure that the audio transmission is both reliable and also compliant to FCC rules. Therefore it is necessary to periodically check if the used frequency is still available, i.e. not occupied by a licensed broadcast or an interfering signal.
  • the check can only be performed when the transmission is interrupted; the reason should be apparent. If the presently used frequency is occupied the transmitter switches to the frequency that has previously been transmitted in the RDS information as "Alternate Frequency". Thus it can be ensured that the radio connection between the audio player device and the FM radio receiver complies to the FCC rules at all times, and is also made more reliable. All this happens, according to the inventive method, in an automatic manner without any user interaction required.
  • the exemplary embodiment may further comprise the steps: interrupting the transmission of the modulated audio data; detecting if the alternate frequency is still available; - if the alternate frequency is no longer available: updating the stored list of available frequencies (i.e. removing those from the list which are not available anymore and adding those that have now become available); selecting another frequency from the list of available frequencies as alternate frequency resuming transmission of the modulated audio data on the used frequency. These steps are repeated until the availability of a selected alternate frequency has been verified. The verified information on the alternate frequency is then transmitted to the FM receiver through the RDS system.
  • the transmitter performs a new scan for available frequencies at the next opportunity.
  • the transmitter may perform a scan when the user shows an indication that he does not want to use the audio transmission anymore, e.g. after pressing the "pause” or “stop” button on the device or after switching it off.
  • the AF frequency may also be possible to send the AF frequency only when it is detected that the presently used frequency becomes unavailable.
  • "Becoming unavailable" in this conjunction means that it is detected that an interfering signal or incoming licensed transmission comprises a signal level exceeding a certain threshold. It is within the scope of the invention to perform a scan such that is can be detected if the level of such signals is increasing over time, thus indicating that the presently used frequency will become unavailable.
  • An advantage of not providing the FM radio receiver with an AF could be that it is thus not able to change the frequency by itself, but stays tuned to the frequency used by the audio transmission. However this entails the risk that strong distortions that occur may completely block the used frequency. In that case it would not be possible to transmit the AF before the frequency becomes unusable.
  • the step of interrupting the transmission of the modulated audio data is preceded by - analyzing the audio data to detect the audio volume; and if the volume falls below a pre-determined threshold, performing any of the sequences of before mentioned method steps described above which requires interrupting the audio transmission.
  • the time for interrupting the audio transmission can be made very short so that it will practically not be noticed by the listener in the form of dropouts in the audio playback, it is advantageous to perform necessary interruptions preferably during audio passages with no or at least very low volume, e.g. in a pause between two tracks. When the interruption can be timed such that it is performed in such pauses the listener will not be disturbed.
  • the method further comprises - receiving information from the audio player device; reformatting the information into a format used by the Program Service Name function (PS), Program Type Code (PTY) function or Radio Text function (RT) of the RDS system; and transmitting the reformatted information to be received by the RDS capable FM radio receiver.
  • PS Program Service Name function
  • PTY Program Type Code
  • RT Radio Text function
  • Mobile audio players and similar devices usually provide many additional information apart from the pure audio signal. Track title, track time played/remaining and other information enhance user comfort substantially. Thus it is advantageous to display this information also on the FM radio receiver.
  • Different features of the RDS system can be utilized for that purpose.
  • PS Program Service Name
  • RT Radio Text
  • mp3 files contain a data field indicating the musical genre this may also be displayed through the Program Type Code (PTY) function, like Rock, Pop, jazz etc.
  • PTY Program Type Code
  • the FM radio receiver In order to have the FM radio receiver display such information it must usually be reformatted into the specific RDS format (e.g. PS field only enables to use 8 digits at a time). A kind of conversion according to this embodiment is thus useful to enhance user comfort. Even more advanced features may be incorporated in this manner. That is, much additional information can be relayed to the FM radio receiver. For example the audio player could indicate that the internal battery is running out and a corresponding warning could then be displayed on the car radio or like. Or a warning message like "no free frequencies found! could be displayed. For the artisan many similar uses enabled by this feature should be apparent.
  • the RDS Program Identification Code PI is used for detecting if a frequency is being used for broadcast transmissions.
  • a main object of the invention is not to interfere with licensed broadcasts it is advantageous to use the PI code transmitted by transmitters as conventional radio stations to decide if a signal received belongs to a licensed broadcast. If no PI code is received this indicates that the signal is not licensed and must thus not be treated in the same manner as a legal licensed broadcast which is not to be interfered with according to FCC. Also this can avoid using complex techniques to decide about a certain signal if a PI code can simply be identified.
  • a method for controlling radio transmission of audio data wherein audio data from an audio player device is modulated by FM- modulation and transmitted to be received by an RDS capable FM radio receiver.
  • the method comprises selecting at least one frequency; - transmitting said selected frequency as Alternate Frequency of the RDS system to be received by said RDS capable FM radio receiver; receiving an input and responsive thereto interrupting said audio transmission; switching to said transmitted frequency; and - resuming transmission of said audio data using said transmitted frequency.
  • This embodiment is a kind of semi-manual alternative.
  • the selection of a suitable frequency is automatically done on the side of the FM radio receiver, similar to the preceding embodiments.
  • the selection on the side of the transmitter is only semi- automatic. Changing the frequency has to be "triggered" by an input. This enables a very simple implementation of the invention, while still maintaining improved user comfort, as his FM radio receiver will automatically tune to the right frequency.
  • the transmitter already transmits an alternate frequency and only upon an input, that is, a kind of ,,trigger signal", it stops transmission on the currently used frequency, switches to the new frequency and resumes transmission on this new frequency.
  • the transmitter starts transmitting the alternate frequency after reception of the ,,trigger signal", and some time later (a time span which is chosen such that the receiver most probably will have been able to receive the transmitted alternate frequency) stops transmission on the currently used frequency and resumes transmission on the alternate frequency.
  • the input is an input received from a user, that is, the frequency change is triggered by a user in a manual way. In other embodiments it can also be an input not (or at least not directly) caused by a user, that is, be initiated by another external event than a user input.
  • the frequency is selected from FM radio frequencies on the base of a random function. Randomly choosing between all possible FM radio frequencies, that is, e.g. 88-108 MHz, is an easy way to implement a selection method.
  • the method further comprises storing a list comprising at least two frequencies, wherein said frequency is selected from said list.
  • a device manufacturer to pre-program certain frequencies, e.g. such that are known to be used only rarely.
  • the list can also be entered manually by a user, e.g. on first initialization of a device operating according to the inventive method.
  • the list can also be compiled according to location information and a data-base which contains licensed transmitter stations and their locations.
  • a location-specific list could also be downloaded from a server (e. g. by a mobile cellular data connection), after a request containing the location information of a user and his vehicle (either GPS location or the cell information from the cellular network). It can also be learnt by the device (e.g. all frequencies formerly used with this device, sorted in descending order according to the listening time, with that frequency on top of the list that was used for the longest time).
  • the frequency is selected according to said user input.
  • the user does not only trigger the frequency change, he actively indicates a certain preference for this change. That is, the user can e.g. input a desired frequency directly. Or he can indicate to use a higher/lower frequency or like.
  • the method further comprises receiving information from said audio player device; reformatting said information into a format used by the Program Service Name function (PS), Program Type Code (PTY) function or Radio Text function (RT) of the 5 RDS system; and transmitting said reformatted information to be received by said RDS capable FM radio receiver.
  • PS Program Service Name function
  • PTY Program Type Code
  • RT Radio Text function
  • a computer program product comprising program code means stored on a computer readable medium for carrying out the method of the invention when the program product is run on a computer or network device.
  • an electronic device for radio 5 transmission of audio data from an audio player device for being received by an RDS capable FM radio receiver comprises a receiver adapted for scanning an FM frequency range to detect available radio frequencies on which no broadcast transmissions or interfering signals are currently received (i.e. no signals having a level above a pre-determined threshold, like e.g. the 0 background noise level); a memory device for storing detected available frequencies; a controller adapted for selecting one of the stored frequencies; an audio input interface for receiving audio data from the audio player device; and a transmitter adapted for modulating received audio data with FM modulation; and - transmitting the FM modulated audio data on a frequency selected by the controller.
  • the controller can for example be set up such that preferably the last used frequency is used in order to avoid re-tuning of the FM radio receiver.
  • the object of the receiver is mainly carrier detection rather than FM audio reception, therefore certain optimizations are required for enhancing the sensitivity rather than reception quality of audio. DSP techniques may also be used for this enhancement.
  • the receiver can also be enabled to perform the function of FM reception, as the narrow-band carrier detection mode may be just a special mode of the receiver. This particularly concerns devices having an integrated FM radio which can additionally be used as a receiver according to the present invention.
  • the controller is further adapted for controlling the receiver for repeating the scanning of the FM frequency range to detect available radio frequencies; and if available frequencies have changed, updating the stored frequencies accordingly.
  • the controller can be set up for performing a repetition of the scanning step in different ways, for example using a fixed re-scan interval. A scan can as well be triggered when certain pre-determined criteria are fulfilled. It is within the scope of the invention to scan only a sub-set of frequencies instead of the whole frequency range, or only to re-scan the stored frequencies.
  • the controller is further adapted for controlling the transmitter to interrupt the transmission of the audio data, e.g. while the receiver is performing the scanning operation. Advantages of such operation have been described above.
  • controller is further adapted for controlling said transmitter to transmit at least one of said stored frequencies as Alternate Frequency of the RDS system. This function is required for the advanced features of the invention in conjunction with re-
  • the inventive device further comprises an analyzer component adapted for analyzing the audio data to detect the audio 15 volume and indicating to the controller when the volume falls below a pre-determined threshold.
  • the controller is enabled to trigger re-scanning operations or other actions requiring an interruption of the audio transmission only when they are likely to pass unnoticed by a listener.
  • the receiver and the transmitter are integrated into a transceiver unit. While this may entail certain technical drawbacks it can help to reduce circuit area and also manufacturing costs.
  • the inventive device further comprises an information interface for receiving information from the audio player device; and a reformatting component for reformatting the information into a format used by the Program Service Name (PS) function, Program Type Code (PTY) function or Radio Text (RT) function of the RDS system;
  • PS Program Service Name
  • PTY Program Type Code
  • RT Radio Text
  • the transmitter is further adapted for transmitting the reformatted information to be received by the RDS capable FM radio receiver.
  • Advantages of such operation have been described above.
  • this reformatting component can be integrated into the controller.
  • the receiver is adapted to use the RDS Program Identification Code (PI) for detecting if a frequency is being used for licensed broadcast transmissions. That is a simple way to make use of this feature of RDS, in order to avoid complex signal detection schemes that might be required otherwise to detect licensed legal broadcasts. Instead of developing corresponding circuitry, standard components used for RDS transmitters or at least their layout might be used. If a PI code is received the corresponding licensed broadcast can easily be identified, and if no PI code is received it can be concluded that the corresponding broadcast is no licensed broadcast.
  • PI RDS Program Identification Code
  • an electronic device for radio transmission of audio data from an audio player device for being received by an RDS capable FM radio receiver comprising: a controller adapted for selecting at least one FM radio frequency; an audio input interface for receiving audio data from said audio player device; a transmitter adapted for - modulating received audio data with FM modulation; and transmitting said FM modulated audio data on a frequency selected by said controller; and an input element for receiving an input; wherein said controller is further adapted for controlling said transmitter to transmit said selected FM radio frequency as Alternate Frequency of the RDS system; detecting an input to said input element and responsive thereto - interrupting the transmission of said audio data; switching to said transmitted frequency; and resuming transmission of said audio data using said transmitted frequency.
  • the input element is user-operable.
  • controller is further adapted for selecting said frequency from FM radio frequencies on the basis of a random function.
  • the device further comprises a memory device for storing a list comprising at least two FM radio frequencies; and the controller is further adapted to select the frequency from said list.
  • controller is further adapted to select said frequency based on said input.
  • the device further comprises: an information interface for receiving information from said audio player device; and a reformatting component adapted for reformatting said information into a format used by the Program Service Name (PS) function, Program Type Code (PTY) function or Radio Text (RT) function of the RDS system; wherein said transmitter is further adapted for transmitting said reformatted information to be received by said RDS capable FM radio receiver.
  • PS Program Service Name
  • PTY Program Type Code
  • RT Radio Text
  • an audio player device comprising a device according to the above described implementations.
  • an external module for the audio transmission that can be connected with an existing audio player
  • the advantages should mostly be apparent to an artisan.
  • One possible advantage is, for example, the use of an integrated module performing the FM modulation not from analog audio data but from digital, possibly compressed audio data. This can help to reduce the quality loss that is in principle unavoidable due to the FM modulation of already processed audio data.
  • the information interface is easier to implement within such a player having a module according to the invention.
  • Fig. 1 shows a flow diagram of an embodiment of the method according to the invention
  • Fig. 2 shows a flow diagram of further steps of another embodiment of the method according to the invention.
  • Fig. 3 shows a schematic view of an embodiment of a device according to the invention.
  • Fig. 1 shows the steps of an example embodiment of the method according to the invention.
  • the respective frequency range e.g. 88-108 MHz for FM radio
  • Available is particularly to be understood as such frequencies which are not used for a licensed broadcast (e.g. a radio station program), which is not to be interfered with according to FCC.
  • PI Program Identification Code
  • the Program Identification Code (PI) of the RDS system is evaluated to determine if a received signal on a scanned frequency belongs to a licensed broadcast.
  • step 104 If such a PI code is received it can be verified if the sender is associated with a licensed legal broadcast.
  • the frequencies, that are considered to be available for the transmission, are then stored in step 104. If there are no available frequencies found at this point an error message can be outputted. For the following steps it is assumed that at least two frequencies are found to be available. In step 106 one of those at least two frequencies is selected for the intended audio transmission. The selection may be based on various parameters, depending on the particular situation. For example, if - in an earlier connection between the audio player and the FM radio receiver - the user has already stored a specific frequency as a preset in his car radio or like, it would be advantageous to re-use this frequency for convenience.
  • this frequency is still available one possible selection criterion could be to favor the last used frequency.
  • an indicator of the channel quality e.g. how strong background signals are on this frequency, and then preferably choose the one with the highest expected quality.
  • Other criteria should be apparent to an artisan.
  • step 108 the audio data are received which are to be transmitted.
  • this includes receiving the audio data through an external interface from an external audio player device such as an MP3 player, e.g. through a conventional cable connection or a suitable wireless link.
  • an external audio player device such as an MP3 player
  • the transmission device according to the invention is a separate device or module which is connectable to an audio player device.
  • the invention includes receiving the audio data in various common formats, both digital and analog, and also in compressed formats like MP3 or the like as well as uncompressed audio data.
  • step 1 10 the received audio data are FM-modulated according to a standard FM radio broadcast.
  • this may require an intermediate decoding step performed with known techniques in order to transform the audio data into a format being suited for being subjected to a standard FM modulation.
  • this module will usually be connected to a headphone or line-out output of the player device, this output providing standard analog stereo signals.
  • suitable decoding steps might be required, which can be performed according to known techniques.
  • step 1 12 the FM-modulated audio data are sent to the RDS capable FM radio receiver, using the frequency that was selected before.
  • This step concludes the description of the basic operation of the inventive method.
  • the major advantage lies in the fact that any RDS capable FM radio receiver can be used to play back the audio originating from the audio player device.
  • any RDS capable FM radio receiver can be used to play back the audio originating from the audio player device.
  • advantages provided by the method according to the invention which will become apparent from the further description.
  • the basic operation method just described already provides the advantage that the user is not forced to search for suitable available frequencies in a manual way. This can be troublesome and inconvenient. With the present invention this step can be performed automatically when first initiating the audio transmission, and a free frequency will then be found faster and in a far more comfortable way for the user.
  • the FM radio receiver could be of a simple type. However the more advanced features of the present invention make use of the enhanced capabilities provided by an FM radio receiver being capable to handle the Radio Data System (RDS).
  • RDS Radio Data System
  • Fig. 2 shows further steps of the method of the invention.
  • the steps shown here continue the basic steps described in conjunction with fig. 1.
  • the transmission of the modulated audio data is performed in step 112 as in fig. 1.
  • At least one AF frequency is transmitted as well in step 1 12 (in another embodiment this part of this step can be omitted, as described later).
  • step 202 if there is a pause or a low volume passage in the audio. If there is no such passage transmission is continued and the detection is repeated. If a pause or like is found in the audio it is checked, in step 204, if the presently used frequency is still available, i.e. not used by another transmitter.
  • Step 204 may also include checking all the other frequencies stored in the initial scanning step described in fig. 1. In the latter case step 204 may also include updating the stored frequency list in case there are changes detected. If the presently used frequency is still free the transmission (step 112) of the audio data is continued on this frequency. However if the frequency is found to be occupied by a licensed transmitter or an interfering signal is detected on that frequency, a new frequency is selected from the stored frequencies (step 206); in the embodiment depicted here this frequency is one of the at least one AF frequencies transmitted in step 1 12. In another embodiment this frequency is transmitted to the FM radio receiver as an Alternate Frequency according to the AF function of RX)S only after selecting a new one, instead of the manner described above.
  • transmitting should of course be continued until the FM radio receiver most probably has received the alternate frequency.
  • the transmitter then switches to the newly selected frequency and continues transmission of the audio data on that frequency.
  • the FM radio receiver will follow according to the AF function and tune to that frequency such that the audio playback can continue.
  • Fig. 3 shows components of a device 20 according to the invention.
  • a receiver component 2 is connected with an antenna 14, the receiver 2 being adapted for scanning the FM frequency range in order to detect frequencies which are available. Available within the concept of the present invention means that no licensed transmitter is broadcasting on the frequency, and also that no other interfering signal is detected.
  • a memory device 4 is provided for storing the found available frequencies.
  • a main controller unit 6 is provided for selecting from these stored frequencies.
  • An audio interface 8 receives audio data from an audio player device (not shown). It should be noted that, although this interface is shown here as a connection to an external player device it can of course also be implemented as an internal interface. The latter relates mainly to the case wherein the device according to the invention is incorporated into a music player or like.
  • the received audio data are sent to a transmitter component 10, the transmitter 10 being adapted for performing an FM modulation of the audio data according to known techniques. It is further adapted for sending out the modulated audio data using the antenna 14 on a frequency selected by the controller 6.
  • An information interface 18 is provided, for receiving information from the audio player device. Similarly to the audio interface 8 this may, other as depicted here, also be implemented as an internal interface when the inventive device is a module built into an audio player. Also it can be a wired as well as a wireless interface, e.g. Bluetooth.
  • the information interface is adapted to receive certain playback related information from the player device, e.g. track title, track time, music genre, music player identification etc. These data are relayed to a reformatting component 16 which is adapted to reformat the information to be used by the RDS functions PTY, PS or RT.
  • the track title could for example be reformatted into a RT Radio Text format
  • the genre could be transformed into a PTY indication
  • an identification of the audio player like "Tills MP3 player" could be displayed as the PS information.
  • an analyzer component 12 is shown in this figure, which is adapted to analyze the received audio data to detect pauses or passages with low volume. If such sections are detected the analyzer 12 can indicate this occurrence to the controller 6, which in turn can trigger a frequency check operation with the receiver 2. That is, to detect if a presently used frequency is still available.
  • receiver 2 and transmitter 10 may either be separate components as depicted here, or may as well be respective sections of an integrated transceiver unit.
  • While the invention is not limited to be used in conjunction with a car radio system it provides specific advantages in such an environment.
  • the vehicle a car radio system is installed in will usually travel through areas with somehow different reception conditions.
  • the car radio will occasionally leave the coverage range of radio programs or radio stations and/or enter the coverage range of others. Therefore the situation related to available frequencies is constantly changing over time when traveling.
  • the private FM transmission used by the present invention is in principle allowed by the FCC.
  • an unlicensed transmitter is not to interfere with a broadcast of any licensed transmitter. Therefore it is one major object of the invention to avoid the occurrence of such interferences.
  • the private transmitter has a very limited power output it is also very likely that attempting to transmit on a frequency used by a much stronger licensed transmitter will not provide a satisfactory audio quality in the FM radio receiver.
  • a somehow similar problem is that also other transmissions or interfering signals not originating from licensed transmitters may cause disturbances severely reducing the audio transmission quality, or even block the transmission altogether. As such signals and transmissions are also likely to change when traveling it is also an object of the invention to maintain the maximum quality of the audio transmission even under such changing conditions.
  • the object just mentioned above can be solved according to the invention by making use of features of the RDS system.
  • the user is required to monitor manually if his personal unlicensed transmitter, which is set to a certain frequency, will interfere with a licensed broadcast in order not to violate the FCC regulation.
  • the manually selected transmission frequency becomes unusable for the audio transmission due to disturbances he is further forced to manually re-tune both the FM radio receiver and the personal transmitter. This can cause distractions when driving which may severely endanger driving safety.
  • the present invention in contrast enables automatic re-tuning which solves these problems.
  • the receiver of the device according to the invention occasionally detects if the present frequency used for transmission is still available, i.e. if the transmission is not likely to interfere with licensed broadcasts as well as being disturbed by other interfering signals. In case the presently used frequency becomes unusable for the transmission due to such reasons, an automatic switching is enabled.
  • a separate transmitter and receiver as well as using an integrated transceiver unit.
  • Providing two separate units as receiver and transmitter can be advantageous as those two units have different objects.
  • the main object of the receiver is to scan a given frequency range to reliably detect available frequencies, i.e. also to rule out that even a signal with rather low level is present which could indicate that a licensed broadcast is using that frequency. Therefore it is optimized for that specific purpose - carrier detection - mainly, while a good audio quality of a received radio program is irrelevant.
  • This is in contrast to a "real" FM radio receiver which shall mainly provide a good reception quality, good audio quality and low noise level etc., while it is not particularly necessary to properly receive even very weak radio broadcasts.
  • the narrow-band reception mode for carrier detection can also be only one specific mode of the receiver. It can still comprise at least another mode optimized for good FM audio reception, e.g. in case a device according to the invention is further equipped with conventional FM audio reception capabilities.
  • the object of the transmitter in a device according to the present invention is of course also different from that of the receiver.
  • a high audio quality is the main optimization goal, to ensure the best listening experience to the user of the inventive device. This involves providing the highest possible signal quality, as well as the best achievable output signal strength, given the limitations of the output power according to FCC.
  • transmitter and receiver may advantageously be achieved through separate devices or circuits, while optimizing the respective sections of an integrated transceiver may be more difficult in certain cases.
  • providing only one circuit fulfilling both objects can help to reduce manufacturing costs as well as circuit area, though probably requiring a more intricate circuit development process or accepting certain compromises in transmitter/receiver properties.
  • the receiver can be operated independently from the transmitter it is possible to perform the scanning for available frequencies in a kind of "background" mode, without interrupting the transmission of the FM audio signal. That way it is easier to keep track of changes in free frequencies, although it is naturally not possible to detect if the presently selected transmission frequency is still not used by other transmitters, as long as the audio transmission is maintained. As scanning the whole frequency range will take up much more time than just checking if the presently used frequency is still free, this can still provide for a more robust transmission as the stored alternative frequencies can be kept up to date. For checking if the presently used frequency is still free it will in every circumstance be necessary to shortly interrupt the audio transmission.
  • the main object associated with this interruption is to make it as little noticeable to the listener as possible.
  • the transmitted audio data are analyzed in order to detect passages within an audio track where the interruption is not or at least hardly noticeable, i.e. by finding low or no volume sections, or even using psycho- acoustic methods or signal processing methods like analysis of the audio spectrum for detecting sections wherein an interruption is less annoying to a user. It is also within the scope of the present invention to actively control the player device to "hide" the interruption, e.g. to delay starting the next track until the interruption has been performed.
  • the main feature of the present invention is to use RDS to control the transmitter such that only free channels are used. These are channels that are free from legal (licensed) broadcast transmission, and preferably also free from other signals which might distort or block the audio transmission.
  • the method of the invention performs this according to the following basic steps:
  • the receiver scans the respective frequency range to find available frequencies that are not used for licensed broadcasts -
  • the free frequencies that are found are stored, and either the device according to the invention automatically selects one for transmission, or the user manually selects one
  • the user has to tune the FM radio receiver, e.g. his car radio, to the selected frequency and activate the Alternate Frequency function of RDS.
  • This frequency may be stored in the car radio as a preset.
  • the receiver scans for free frequencies and selects one this preset frequency is favoured in the selection process, in order to re-use the stored preset in the car radio. If the corresponding frequency is still available this can help to avoid initial re-tuning of the FM radio receiver.
  • the transmitter is activated and the audio data from the audio player are transmitted to the FM radio receiver in form of an FM broadcast like that of a normal radio station.
  • a main advantage of this method is that this happens completely transparent from the FM radio receiver's point of view.
  • the car radio or other FM radio receiver will treat the transmission from the audio player as if it were a normal FM radio broadcast. Thus no changes to the car radio are required, and every RDS capable FM receiver can play back the transmitted audio.
  • the method according to the invention may further comprise the following steps: -
  • the transmitter is periodically switched of, such that the receiver is enabled to monitor the background level of emissions and to check if the used frequency is still available (i.e. if no licensed or other broadcast uses the frequency).
  • this may be performed in a regular order, i.e. every x seconds, or be triggered in a manner to be described later on, or in any other suitable way, e.g. on a random basis.
  • there may be defined a threshold for signal levels wherein only those received signals are treated as a broadcast which have a level above this threshold. As there will always be some background (noise) level present this is necessary to decide if a signal is received.
  • the phrase "no broadcast transmissions or interfering signals are currently received" is therefore to be understood in that manner. - If the background level is deemed excessive, e.g. because some other unlicensed transmitter or some other source is causing a distortion on the frequency, or if the frequency is now occupied by a licensed broadcast another one of the stored frequencies is selected. This frequency is then sent to the FM radio receiver indicating the newly selected frequency as an alternate frequency according to the Alternate Frequency (AF) function of the RDS system. The transmission can be maintained for a reasonable time such that it is ensured the FM radio receiver correctly received the new frequency.
  • AF Alternate Frequency
  • the transmitter then stops the transmission on the original frequency and switches to the newly selected frequency to resume the transmission of the audio.
  • the RDS capable FM radio receiver now switches to the new frequency (if the AF feature is activated).
  • the present invention provides a more stable connection between the transmitting (audio player) and the receiving device (car radio etc.). Furthermore the requirements of the FCC concerning not interfering with legal, licensed broadcasts can easily be fulfilled. Re-tuning is done completely automatically and in a manner transparent for the FM radio receiver, eliminating the necessity for manual re-tuning by the user.
  • the present invention is not limited to be used in conjunction with a car stereo system. However particularly for the driver of a vehicle it is advantageous that re-tuning is performed automatically, thus ensuring the driver is not distracted in order not to affect driving safety.
  • the sharing (i.e. transmitting) device could utilize RDS (using some proprietary coding scheme) to request the receiving device to perform a scan and report back the clear channels.
  • the Alternate Frequency function of RDS uses the Program Identification (PI) code to determine which program is actually received.
  • PI Program Identification
  • This code is a unique code identifying a certain transmitter, e.g. radio station.
  • PI code is a unique code identifying a certain transmitter, e.g. radio station.
  • the PI code is in every case unique and does not collide with a PI code allocated to a licensed broadcast station.
  • the method and device according to the present invention helps to reduce the occurrence of low power transmitters clashing on the same frequencies (in urban areas the number of free channels could be low).
  • the user initiates the transmission mode.
  • the controller puts the receiver or the receiver part of the integrated transceiver into receive mode and automatically scans the respective frequency band. A list of found 25 available frequencies is then presented to the user, preferably on some kind of display.
  • the user selects one of these frequencies, for example by scrolling, highlighting and entering on a key pad being provided on the device, or using some other suitable input device.
  • 30 The user is prompted to tune his FM radio receiver to the selected frequency. It is advisable that the user presets the stored frequency on the FM radio receiver as this will store the transmitter's unique PI code.
  • the PI code can be hardwired within the device, but the invention is not limited thereto.
  • the PI could for example be generated from the International Mobile Equipment Identification IMEI (in some coded way), so that each phone will have a unique PI.
  • AF Alternate Frequency
  • the device of the invention basically operates in one of three different modes:
  • the device periodically switches to narrow band receiver mode. That is, in case an integrated transceiver unit is used the transmitting section is de-activated and the receiving section is activated instead.
  • the switching point could be linked to audio pauses so as to be less intrusive to the user.
  • the receiver is a carrier detector and it basically detects the presence of a signal in the receive channel. It could also periodically check the signal strength of free channels it listed in the initialization phase. This can, with separate transmitter/receiver, also be accomplished during the audio transmission in a kind of background scanning mode.
  • the transmitter should be sending regular PI (Program Identification) and could use the PS Field (or RT) to display the MP3 track being played or other playback related additional information (track time and the like).
  • regular PI Program Identification
  • PS Field or RT
  • the receiver detects (after a suitable number of averages) a high level of interference on the channel, due to a licensed broadcast transmitting on the frequency or other interfering signal, then it transmits one of the AF frequencies in its list using the standard RDS AF function. In other embodiments one or more AF frequencies are transmitted continuously, then this step can be omitted here.
  • the FM radio receiver may well check the AF frequency for signal strength but because there is no signal it will remain on the wanted one.
  • the sender will now switch to the AF frequency. This should cause the radio receiver to enter the AF mode because it can no longer detect the presence of the matching PI code.
  • the radio receiver should check the AF frequency and find the sender already there broadcasting the correct PI code. It should then unmute the audio and the system returns to monitor mode.
  • While the invention has mainly been described in the combination of a mobile music player and a car FM radio receiver it is not limited to this particular combination.
  • a mobile music player could be used to play back music through the fixed FM radio receiver in the living room, the bathroom, the kitchen or elsewhere.
  • a device according to the invention can, if equipped with a device according to the invention, be used to provide music to a portable FM radio receiver to be used in the garden of the house.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

La présente invention concerne un procédé de commande de la transmission de données audio dans lequel des données audio provenant d'un dispositif de lecture audio sont modulées en fréquence et émises pour être reçues par un récepteur radio MF à fonctionnalité SRD. Le procédé consiste à sélectionner au moins une fréquence, à envoyer cette fréquence sélectionnée en tant que fréquence de remplacement du système SRD destinée à être reçue par le récepteur radio à fonctionnalité SRD, à recevoir une entrée et en réponse à cette dernière, à interrompre ladite émission audio, à passer sur la fréquence envoyée et à reprendre l'émission desdites données audio au moyen de ladite fréquence envoyée. Cette invention concerne également un dispositif électronique destiné à l'émission radio de données audio à partir d'un dispositif de lecture audio à destination d'un récepteur radio MF à fonctionnalité SRD, ce dispositif comprenant une unité de commande prévue pour sélectionner au moins une fréquence radio MF, une interface d'entrée audio prévue pour recevoir les données audio provenant du dispositif de lecture audio, un émetteur capable de moduler en fréquence MF les données audio reçues et d'émettre lesdites données audio à modulation MF sur une fréquence sélectionnée par ladite unité de commande, et un élément d'entrée destiné à recevoir une entrée, ladite unité de commande étant également conçue pour commander ledit émetteur afin qu'il émette la fréquence radio MF sélectionnée en tant que fréquence de remplacement du système SRD, détecte une entrée provenant de l'élément d'entrée et en réponse à cette dernière, interrompe l'émission desdites données audio, passe sur ladite fréquence envoyée et reprenne l'émission desdites données audio au moyen de ladite fréquence transmise.
EP05780475.9A 2005-04-05 2005-08-05 Procede et dispositif d'emission en modulation de frequence de donnees audio a destination d'un recepteur radio mf a fonctionnalite srd Active EP1867077B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/099,981 US20060223467A1 (en) 2005-04-05 2005-04-05 Method and device for low-power FM transmission of audio data to RDS (Radio Data System) capable FM radio receiver
PCT/IB2005/002347 WO2006106379A1 (fr) 2005-04-05 2005-08-05 Procede et dispositif d'emission en modulation de frequence de donnees audio a destination d'un recepteur radio mf a fonctionnalite srd

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EP1867077A1 true EP1867077A1 (fr) 2007-12-19
EP1867077A4 EP1867077A4 (fr) 2010-10-13
EP1867077B1 EP1867077B1 (fr) 2013-12-25

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EP (1) EP1867077B1 (fr)
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Families Citing this family (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8036609B2 (en) 2003-12-05 2011-10-11 Monster Cable Products, Inc. FM transmitter for an MP player
US8774860B2 (en) * 2005-04-05 2014-07-08 Nokia Corporation Method and device for low-power FM transmission of audio data to RDS capable FM radio receiver
US8503929B2 (en) * 2005-05-26 2013-08-06 Broadcom Corporation Method and system for routing FM data to a bluetooth enabled device via a bluetooth link
US8285205B2 (en) * 2005-05-26 2012-10-09 Broadcom Corporation Method and system for a single chip integrated Bluetooth and FM transceiver and baseband processor
TWI287369B (en) * 2005-10-14 2007-09-21 Hon Hai Prec Ind Co Ltd Radio transmitting system, method and electronic entertainment device
DE102006018155A1 (de) * 2006-04-19 2007-10-25 Siemens Audiologische Technik Gmbh Funksendevorrichtung und Steuervorrichtung für Veranstaltungsräume sowie entsprechende Verfahren
US7558527B2 (en) * 2006-08-25 2009-07-07 Delphi Technologies, Inc. Radio receiver system and method of injecting audio content
US7941141B2 (en) * 2006-08-31 2011-05-10 Garmin Switzerland Gmbh System and method for selecting a frequency for personal-use FM transmission
US20100159836A1 (en) * 2006-09-05 2010-06-24 Francis Lau Automatic present tuning using rds protocol
US20080064347A1 (en) * 2006-09-12 2008-03-13 Monster Cable Products, Inc. Method and Apparatus for Identifying Unused RF Channels
EP2077008A4 (fr) * 2006-10-24 2012-01-04 Nokia Corp Transfert sans interruption d'émissions radiophoniques
WO2008062249A1 (fr) * 2006-11-23 2008-05-29 Nokia Corporation Détermination assistée de canaux libres et de canaux bloqués
US8655351B2 (en) 2006-11-23 2014-02-18 Nokia Corporation Method and device for maintaining continuity of radio transmissions
US7680459B2 (en) * 2006-12-13 2010-03-16 Sony Ericsson Mobile Communications Ab FM transmission system and method
US7792498B2 (en) * 2006-12-28 2010-09-07 Texas Instruments Incorporated Apparatus for and method of automatic radio link establishment
CA2671731A1 (fr) * 2007-01-04 2008-07-17 Qualcomm Incorporated Procede et appareil de detection de spectre reparti destines a communication sans fil
US20080171536A1 (en) * 2007-01-17 2008-07-17 Darius Katz System and method for broadcasting an alert
JP4728973B2 (ja) * 2007-01-19 2011-07-20 ローム株式会社 Ｆｍ送信機、ならびにそれを用いた電子機器、自動選局方法
JP2008177960A (ja) * 2007-01-19 2008-07-31 Rohm Co Ltd Ｆｍ送信機、ならびにそれを用いた電子機器
US20080214238A1 (en) * 2007-03-01 2008-09-04 Motorola, Inc. Devices and methods for facilitating hands-free mode with fm transmitter
EP1968218B1 (fr) * 2007-03-08 2014-08-13 ST-Ericsson Belgium NV Transmetteur multi-canal
US7822418B2 (en) * 2007-05-14 2010-10-26 Infineon Technologies Ag Device playback using radio transmission
DE102007033736A1 (de) * 2007-05-30 2008-12-11 Navigon Ag Verfahren zum Betrieb eines mobilen Audiogeräts in einem Fahrzeug
WO2008155598A1 (fr) * 2007-06-20 2008-12-24 Nokia Corporation Procédé et dispositif pour transmettre des données multimédia à des récepteurs de diffusion
US20090111519A1 (en) * 2007-10-31 2009-04-30 Broadcom Corporation Fm channel scanning
EP2080281A4 (fr) * 2007-10-31 2012-01-18 Agere Systems Inc Modulateur/émetteur fm à courte portée et système l'incorporant
US20090111389A1 (en) * 2007-10-31 2009-04-30 Broadcom Corporation Auto channel selection for fm transmitter
US20090117857A1 (en) * 2007-11-02 2009-05-07 Broadcom Corporation FM radio devices determining preferred inactive FM radio channel for communication
US8503957B2 (en) * 2007-11-21 2013-08-06 Qualcomm Incorporated Radio data system (RDS) data processing methods and apparatus
US8326216B2 (en) * 2007-11-21 2012-12-04 Qualcomm Incorporated Method and system for transmitting radio data system (RDS) data
US8666304B2 (en) * 2007-11-21 2014-03-04 Qualcomm Incorporated Methods and apparatus for downloading one or more radio data system (RDS) group type processing routines for RDS data
US8478216B2 (en) * 2007-11-21 2013-07-02 Qualcomm Incorporated Method and apparatus for searching for or tuning to one or more radio stations with minimum interaction with host processor
US7986928B2 (en) * 2007-12-07 2011-07-26 Motorola Mobility, Inc. Method and apparatus for selecting a radio channel for transmitting an audio signal to a radio local receiver
US20090197534A1 (en) * 2008-02-06 2009-08-06 Sony Ericsson Mobile Communications Ab Automatic setup of radio transmission
GB0804615D0 (en) * 2008-03-12 2008-04-16 Cambridge Silicon Radio Ltd Protocol coexistence
EP2109225A1 (fr) * 2008-04-09 2009-10-14 Tidewell Ltd. Dispositif de transmission
US9065574B2 (en) * 2008-04-30 2015-06-23 Intel Mobile Communications GmbH Frequency tracking for a FMR transmitter
TWI425773B (zh) * 2008-05-09 2014-02-01 Chi Mei Comm Systems Inc 調頻廣播智慧轉換系統及方法
CA2725583A1 (fr) * 2008-05-29 2009-12-03 Tomtom International B.V. Appareil de communication electronique portable, systeme de communication, procede de purge de donnees sur les erreurs s'y rapportant et procede de reduction de retard de resyntonisation s'y rapportant
CN102187584A (zh) * 2009-01-14 2011-09-14 通腾科技股份有限公司 天线输入适配器装置、通信系统、便携式电子通信设备和射频信号传送方法
US8285209B2 (en) * 2009-05-08 2012-10-09 Agere Systems, Inc. Short range FM modulator/transmitter and system incorporating same
US8780982B2 (en) * 2009-07-02 2014-07-15 Qualcomm Incorporated Transmitter quieting and different encoding rates for portions of a set of frames
US9112618B2 (en) * 2009-07-02 2015-08-18 Qualcomm Incorporated Coding latency reductions during transmitter quieting
US8537772B2 (en) * 2009-07-02 2013-09-17 Qualcomm Incorporated Transmitter quieting during spectrum sensing
US8902995B2 (en) * 2009-07-02 2014-12-02 Qualcomm Incorporated Transmitter quieting and reduced rate encoding
US8958475B2 (en) * 2009-07-02 2015-02-17 Qualcomm Incorporated Transmitter quieting and null data encoding
NL2003326C2 (nl) * 2009-08-03 2011-02-04 Phyco Trading B V Werkwijze en systeem voor het informeren van de bestuurder van een voertuig, en computer programma product.
JP5440220B2 (ja) * 2010-01-29 2014-03-12 株式会社デンソー ナビゲーション装置
TWI414263B (zh) * 2010-05-14 2013-11-11 Dartpoint Tech Co Ltd 防水音響枕頭
TW201220724A (en) * 2010-11-09 2012-05-16 Grandex Internat Corp Apparatus and method for automatic wireless link replacement
GB2488146A (en) * 2011-02-17 2012-08-22 Nokia Corp Complying with unlicensed radio transmission regulations whilst provision of media is interrupted
CN102655575B (zh) * 2011-03-04 2017-04-05 炬芯（珠海）科技有限公司 影音播放系统中的音频传输方法及影音播放系统
CN102694994B (zh) * 2011-03-25 2015-06-03 宏碁股份有限公司 从多个讯号源中自动搜寻替代视讯内容的电子装置与方法
US9628207B2 (en) * 2013-10-04 2017-04-18 GM Global Technology Operations LLC Intelligent switching of audio sources
EP3029864B1 (fr) * 2014-12-01 2020-11-18 Harman Becker Automotive Systems GmbH Affichage rapide d'informations relatives à des émetteurs dans un récepteur fm comportant un seul syntoniseur
CN104486709A (zh) * 2014-12-15 2015-04-01 恩平市恩宝电子有限公司 基于频率信号调制技术的无线麦克风系统
CN110351213A (zh) * 2018-04-02 2019-10-18 华为技术有限公司 音频播放方法及设备
CN109003622B (zh) * 2018-09-11 2021-06-04 广州小鹏汽车科技有限公司 降噪处理方法、装置、收音机及交通工具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845873A1 (fr) * 1996-11-29 1998-06-03 STMicroelectronics S.r.l. Méthode de commutation vers des fréquences alternatives pendant les pauses dans le programme diffusé dans un récepteur de radiodiffusion
EP1271816A2 (fr) * 2001-06-21 2003-01-02 Harman/Becker Automotive Systems (Becker Division) GmbH Procédé de recherche d'une fréquence dans un récepteur radio
EP1370053A1 (fr) * 2002-06-05 2003-12-10 Alcatel Système de communication d'un téléphone mobile mains libres ainsi qu'un téléphone mobile et un système audio pour lequel
US20040117442A1 (en) * 2002-12-10 2004-06-17 Thielen Kurt R. Handheld portable wireless digital content player

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07312563A (ja) * 1994-05-19 1995-11-28 Pioneer Electron Corp Ｒｄｓデータ受信表示方法及び装置
KR19980074989A (ko) * 1997-03-28 1998-11-05 배순훈 알디에스방송수신용 카오디오의 이오엔정보저장처리방법
JP4009789B2 (ja) * 1997-10-09 2007-11-21 ソニー株式会社 送信機
US7512380B2 (en) * 2001-08-17 2009-03-31 Intel Corporation Apparatus and methods for finding and using available transmission frequencies
CN1434571A (zh) * 2002-01-23 2003-08-06 杨曙辉 车载式无线mp3接收播放机
US6782239B2 (en) * 2002-06-21 2004-08-24 Neuros Audio L.L.C. Wireless output input device player
US8666524B2 (en) * 2003-01-02 2014-03-04 Catch Media, Inc. Portable music player and transmitter
KR100575963B1 (ko) * 2003-12-31 2006-05-02 삼성전자주식회사 외부음향기기를 통해 음성신호와 알림음을 출력하는휴대폰 제어방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845873A1 (fr) * 1996-11-29 1998-06-03 STMicroelectronics S.r.l. Méthode de commutation vers des fréquences alternatives pendant les pauses dans le programme diffusé dans un récepteur de radiodiffusion
EP1271816A2 (fr) * 2001-06-21 2003-01-02 Harman/Becker Automotive Systems (Becker Division) GmbH Procédé de recherche d'une fréquence dans un récepteur radio
EP1370053A1 (fr) * 2002-06-05 2003-12-10 Alcatel Système de communication d'un téléphone mobile mains libres ainsi qu'un téléphone mobile et un système audio pour lequel
US20040117442A1 (en) * 2002-12-10 2004-06-17 Thielen Kurt R. Handheld portable wireless digital content player

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range from 87,5 to 108,0 MHz", INTERNET CITATION, 1 April 1998 (1998-04-01), pages 1-132, XP002629792, Retrieved from the Internet: URL:http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.142.8848&rep=rep1&type=pdf><#/u [retrieved on 2011-03-24] *
See also references of WO2006106379A1 *

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US20060223467A1 (en) 2006-10-05
CN101142772A (zh) 2008-03-12
WO2006106379A1 (fr) 2006-10-12
CN101142772B (zh) 2016-10-26
EP1867077B1 (fr) 2013-12-25
EP1867077A4 (fr) 2010-10-13

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